**Amido**: An organic compound derived from ammonia.
**Amido group**: Functional group containing nitrogen and carbonyl.
**Amide bond**: Linkage formed between amines and carboxylic acids.
**Primary amide**: Amide with one alkyl or aryl substituent.
**Secondary amide**: Amide with two alkyl or aryl substituents.
**Tertiary amide**: Amides lacking hydrogen on the nitrogen atom.